EP 1414120 A2 20040428 - Spark plug for use in internal combustion engine
Title (en)
Spark plug for use in internal combustion engine
Title (de)
Zündkerze für Verbrennungsmotor
Title (fr)
Bougie d'allumage pour moteur à combustion interne
Publication
Application
Priority
- JP 2002310610 A 20021025
- JP 2003173412 A 20030618
Abstract (en)
A spark plug for use in an internal combustion engine includes a tubular insulator (140, 340) having an axial hole extending therethrough; a center electrode (120) fitted into the axial hole and having a distal end portion (120b) protruding from a distal end of the insulator (140, 340); and a ground electrode (110, 310) arranged such that at least a portion of spark discharge generated between the ground electrode (110, 310) and the distal end portion (120b) of the center electrode includes creeping discharge along the surface of the distal end portion of the insulator (140, 340). The distal end portion (120b) of the center electrode (120) contains Ni as a primary component in an amount of 80 wt% or more and Fe and Cr as secondary components in a total amount of 2.5 wt% to 10.0 wt% and further contains Al as a secondary component in an amount of 0.2 wt% to 0.8 wt%.
Spark plug (100) comprises center electrode (120) having distal end portion (100b) configured so that its surface is formed of nickel alloy having nickel (>=80 wt.%) as primary component, and iron (2.5 wt.%) and chromium (10 wt.%) as secondary components. The nickel alloy further includes aluminum (0.2-0.8 wt.%) as a secondary component. Spark plug comprises tubular insulator (140) having axial hole extending in axial direction, center electrode fitted into the axial hole and having distal end portion protruding from a distal end of the insulator, and ground electrode (110) located diametrically outside of the center electrode and positionally related to distal end portion of the insulator and distal end portion of the center electrode. The ground electrode(s) is configured so that portion of spark discharge generated between ground electrode and distal end portion includes creeping discharge along a surface of the distal end portion of the insulator. The distal end portion of center electrode is configured so that its surface is formed of nickel alloy having nickel (>=80 wt.%) as primary component, and iron (2.5 wt.%) and chromium (10 wt.%) as secondary components. The nickel alloy further includes aluminum (0.2-0.8 wt.%) as a secondary component.
IPC 1-7
IPC 8 full level
C22C 19/03 (2006.01); H01T 13/39 (2006.01); H01T 13/52 (2006.01)
CPC (source: EP US)
H01T 13/39 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1414120 A2 20040428; EP 1414120 A3 20061227; CN 1499686 A 20040526; JP 2004200137 A 20040715; JP 3887010 B2 20070228; US 2004080252 A1 20040429
DOCDB simple family (application)
EP 03256720 A 20031023; CN 200310102589 A 20031024; JP 2003173412 A 20030618; US 66856703 A 20030923